What are signs your metabolism has slowed significantly?

A significantly slowed metabolism often shows up as unexplained weight gain even without eating more, persistent fatigue that sleep doesn't fix, and feeling cold all the time, especially in your hands and feet. You might notice dry skin, thinning hair, and brittle nails. Constipation and sluggish digestion are common, as the body processes everything more slowly. Brain fog, difficulty concentrating, and low mood can also signal metabolic slowdown. Many people find they need to eat far less than before just to maintain their weight. These symptoms overlap heavily with hypothyroidism, which is a common cause of metabolic slowdown, so persistent symptoms warrant a blood test to check thyroid function.